וַיֹּאמְר֞וּ הָ֣בָה ׀ נִבְנֶה־לָּ֣נוּ עִ֗יר וּמִגְדָּל֙ וְרֹאשׁ֣וֹ בַשָּׁמַ֔יִם וְנַֽעֲשֶׂה־לָּ֖נוּ שֵׁ֑ם פֶּן־נָפ֖וּץ עַל־פְּנֵ֥י כָל־הָאָֽרֶץ׃
I rzekli: "Oto zbudujmy sobie miasto i wieżę, którejby wierzch w niebie, a uczyńmy sobie znamię, abyśmy się nie rozproszyli po powierzchni całej ziemi."
Rashi on Genesis
פן נפוץ LEST WE BE SCATTERED ABROAD — That He shall not he able by bringing some plague upon us, to scatter us from here.
Sforno on Genesis
ויאמרו הבה נבנה לנו עיר, this was at the advice of their leaders who wanted to enthrone Nimrod as king over the entire human race,
Radak on Genesis
ויאמרו הבה נבנה לנו עיר, the purpose of the city was residential, the purpose of the Tower was to serve as an observation tower enabling the people in the city to keep track of where their flocks and herds were grazing. It would also serve as a beacon for shepherds who were far away to find their way home by focusing on the Tower.